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Summary of Contents for PRESONUS TUBEPRE
- Page 1 TubePRE Single-Channel Tube Mic-Preamplifier w/ VU Meter User's Manual VERSION 1.0...
- Page 2 During the warranty period Presonus shall, at its sole and absolute option, either repair or replace, free of charge, any product that proves to be defective on inspection by Presonus or its authorized service representative. To obtain warranty service, the purchaser must first call or write Presonus at the address and telephone number printed below to obtain a Return Authorization Number and instructions of where to return the unit for service.
- Page 3 Presonus warranty repair facility in the country where purchased, or to the Presonus factory in the U.S., in the original packaging or a replacement supplied by Presonus, with all transportation cost and full insurance paid each way by the purchaser or owner.
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Page 4: Table Of Contents
Table of Contents 1.1 Introduction................1 1.2 Features..................2 2.1 Controls & Connections ............4 2.2 Front Panel ..................4 2.3 Preamplifier Section .................4 2.4 Back Panel..................6 3.1 Operation ................8 3.2 Dynamic Microphones ...............8 3.3 Phantom-Powered Microphones ............8 3.4 Instrument Input ................8 3.5 Some Thoughts on Vacuum Tubes............8 3.6 Application Guide ................9 3.7 FAQ/Trouble Shooting.............. -
Page 5: Introduction
Presonus equipment, please fell free to contact us! Please pay close attention to how you connect your TubePRE to your system. Improper grounding is the most common cause of noise problems found in studio or live sound systems. -
Page 6: Features
Dual-Servo Gain Stage Your TubePRE contains a dual-servo gain stage (no capacitors). This provides ultra-low noise performance and wide dynamic control. This gives the TubePRE the ability to boost the desirable signal without increasing unwanted background noise. Phantom Power When the phantom power switch is engaged, power is supplied at a constant rate. - Page 7 Mic/Instrument Input The TubePRE has a separate XLR and 1/4” connector on the back of the chassis for signal input from microphones (XLR) or instruments (1/4”).
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Page 8: Controls & Connections
80Hz filter Backlit VU meter 2.3 Preamplifier Section Phantom power is available for the input of the TubePRE. The 48 volts are supplied through the XLR connector for condenser mics and any other devices requiring continuous power (through the XLR input). - Page 9 Provides -20 decibels of attenuation with the push of a button. This is a very useful feature for rapidly reducing the level coming into the TUBEPRE and thus preventing the input signal from distorting the input. This may occur due to a high output level from a microphone or line device.
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Page 10: Back Panel
(care should be taken with instruments having their own built-in preamp not to overdrive the input of the TubePRE). Increasing the gain should provide the signal that is needed from the preamp for a hotter (louder) recording level. - Page 11 1/4” phone plug wiring input and output TIP High (+) SLEEVE GND (-) The output 1/4” phone plug is unbalanced...
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Page 12: Operation
(line level) into the TubePRE is not recommended. 3.5 Some Thoughts on Vacuum Tubes The TubePRE comes supplied with a 12AX7 vacuum tube that meets or exceeds the stated performance criteria for the unit. We expect some owners of the TubePRE will try different tubes to investigate the various performance possibilities they might provide. -
Page 13: Application Guide
If you notice deterioration in sound quality then it’s time to change the tube. Replacing the tube in the TubePRE 1. Unplug the unit. Proceed with caution, as the tube could be hot. -
Page 14: Faq/Troubleshooting
On Recording When using the TubePRE as a front end for a recording device (such as the Presonus FIREstation), it is important to watch your output levels. For example, using the TubePRE for distortion (turning up the gain and tube drive REAL HIGH) could overload the inputs of the recording device. - Page 15 Can I use a different size/style tube in the TubePRE? The only tube that can be used in the TubePRE is a 12AX7. Any variation can cause damage to the unit/user and voids the warranty. Please refer to Section 3.5 of this manual for further directions on changing the tube.
- Page 16 The reason is that the signal being fed into the unit is too loud for the TubePRE. This may cause the unit to distort (In some cases this may be the desired effect).
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Page 17: Technical Specifications
9.1 TECHNICIAL SPECIFICATIONS Preamp Bandwidth............. 10Hz to 50kHz Number of Channels ..............One Performance THD + Noise (Unweighted) ......0.05% @ 0dB Tube Drive ..............10% @ 20dB Tube Drive Noise Floor ................. -94dBu Signal to Noise..............>90dB Power Supply Rejection ............>98dB Amplifier Type.............. - Page 18 Metering VU Meter .............. -20dBu to +3dBu Clip LED ................+20dBu Power Supply Type ............. Linear/External Transformer Input ..............16 VAC/1000mA Power ................16 WATTS Physical Weight ................... 4lbs. Size ................1/3 U Rack Dimensions............5.5” X 5.5” X 1.75” Mounting..........Universal Rack Tray Insert Chassis ..................Steel Front Panel ............
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